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Resistance-feedback noise-cancelling broadband low-nose transconductance amplifier

A transconductance amplifier, broadband low-noise technology, used in differential amplifiers, DC-coupled DC amplifiers, and improved amplifiers to reduce noise effects, etc. Noise figure, effect of good noise performance

Inactive Publication Date: 2015-09-02
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Note that there is a close correlation between input matching and noise in this structure, making it difficult to meet the design requirements at the same time between the two performances

Method used

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  • Resistance-feedback noise-cancelling broadband low-nose transconductance amplifier
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  • Resistance-feedback noise-cancelling broadband low-nose transconductance amplifier

Examples

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Embodiment

[0044] The LNTA circuit provided in this embodiment is implemented using a 0.18μm RF CMOS process, using a 1.8V power supply, and the parameter R F It is 240Ω, the parameter N is 2, and the bias current of the circuit is 14mA. Image 6 The LNTA gain curve is given, which shows that a transconductance gain of about 41.2mS is obtained in a 3dB bandwidth (0.1~1.5GHz), Figure 7 The noise figure results are given, and the noise figure NF is about 2.6dB in the bandwidth of 0.1~1.5GHz. Test the linearity of the low noise amplifier at the frequency point of 1GHz using constant-amplitude dual-tone signals separated by 5MHz, such as Figure 8 As shown, the input third-order intermodulation (IIP3) simulation result is -5.5dBm. The above results show that the LNTA has a working current of 14mA under the condition of 1.8V power supply. Compared with the existing low-noise amplifier, this amplifier is easy to achieve low-voltage and low-power applications.

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Abstract

The invention discloses a resistance-feedback noise-cancelling broadband low-nose transconductance amplifier and belongs to the field of integrated circuits. The amplifier is in an differential input / output structure and comprises a resistance-feedback input stage, a current mirror amplifying stage, a noise-canceling auxiliary stage, and a negative resistance stage; a radio frequency signal VRF+ is input through the resistance-feedback input stage and then divides into two signals; on a main path, one signal is converted into a current signal by an input tube and is then transmitted to an output node Iout+ after being amplified by a current mirror and multiplied by a negative resistance tube; on a noise-cancelling auxiliary path, the other signal is converted by a phase inverter into signal current transmitted to an output node Iout-; the two differential current signals are of equal amplitudes but opposite directions. The amplifier has the advantages that the gain of the amplifier can be evidently increased in a broader spectral range and noise and linear performances are improved.

Description

Technical field [0001] The invention belongs to the field of integrated circuits, and particularly relates to a low-noise transconductance amplifier. Background technique [0002] With the wide application of many communication protocols in the GHz band (such as 3-4G mobile communication, WIFI, and Bluetooth, etc.), software radio technology compatible with multiple protocols has become increasingly important. Correspondingly, the research and development of broadband radio frequency transceiver technology has become increasingly urgent. At the same time, it is noted that with the proportional reduction of CMOS technology, the linearity of CMOS transistors has deteriorated due to the decrease in power supply voltage and the degradation of mobility. [0003] For a long time in the past, circuit designers were accustomed to using voltage signal variables to analyze and characterize the characteristics of circuits, that is, a circuit design technology concept based on the voltage dom...

Claims

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Application Information

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IPC IPC(8): H03F1/26H03F1/32H03F3/45
Inventor 郭本青陈俊文光俊
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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